Hello, I have a composite system with several overlapping FE spaces which I construct in blocks using independent variational forms for each space and then assembling them all into a large block matrix. I would like to enforce exact Dirichlet conditions without penalization (e.g. by using tgv = -1)…

What bookkeeping are you talking about? We could add a new tgv = -3 to handle this (I wanted to do this for a long time), but in the meantime, you can just impose on your off-diagonal blocks something like: varf vGamma(u, v) = on(gamma, u = 1); real[int] marker = vGamma(0, Vh, tgv = -1); for[i,j,v …

Preferred way to construct block matrices with exact Dirichlet BC (tgv = -1)?

General Discussion

arousta (Ali Roustaei) January 15, 2020, 11:14am 3

Also relevant, look at this post:
https://community.freefem.org/t/implementation-of-dirichlet-boundary-condition-when-tgv-1/113

1 Like

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Preferred way to construct block matrices with exact Dirichlet BC (tgv = -1)?

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